Abstract: G25.00006 : Observation of the squeezed state of microwave photon by resolving the even-number Fock states in circuit QED*

Author:

Kyungsun Moon(Dept. of Physics, Yonsei Univ.)

We theoretically propose an elegant way to detect the microwave parametric
down conversion in the circuit QED system. The qubit energy splitting
E$_{01}$ is tuned to be quite close to the fundamental frequency $\omega
_{1\, }$of the microwave photon and the frequency of the pump beam is
chosen to be $\omega_{2}$. We place the qubit at the two-thirds away from
the center of the central resonator, which will make the capacitive coupling
to the third harmonic mode to be negligible. Since the qubit acts as an
optical coupler in our system, one may expect that the following process
a$_{2}^{+}$a$_{1}^{+}$a$_{3}$ may appear and compete with the squeezing
process a$_{1}^{+}$a$_{1}^{+}$a$_{2}$, which will seriously degrade the
quality of squeezing by mixing into the channel. Since the coupling to the
third harmonic mode is negligible for our system, we expect instead to
observe the clear squeezing of the microwave photon with frequency $\omega
_{1}$. We calculate the absorption spectrum of the qubit, which is
experimentally measurable and will clearly reveal the squeezed states as the
coherent superposition of the even-number Fock states.

*This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology(2012R1A1A2006927).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.G25.6